The other thing to remember is that walking 26 miles is a different task to running 26 miles, But in cycling you could be putting out a power similar to walking, or one similar to running, and both would be classed as cycling.
Difficult one to compare, but I'd say they are very very roughly in the same ball-park. One of the things that makes it tricky to compare is that there's huge energy savings to be had riding in a group, compared to running in a group.
No offence mate, but it's definitely genetics I've commute on my bike to work every day without fail for 29 years, I've done bike races from 60 minutes to 8 days in length, fallen off unconscious from heatstroke, raced in Alaska in winter with a torn a cruciate. In short I'm familiar with the concept of suffering a bit. I also know I'm a shit runner, I just don't have the engine to run fast.
A friend did 39.something minutes on his 1st 10K with a hangover having gone to bed at 3am. Run specific training was a few lunchtime 5Ks (he's a fast cyclist though). Genes make a lot of difference. Me, I'm never going to do it